Output current 12V-40A/ 24V-20A, Input voltage 130V-250V, Color Silver, Input cable 110cm, Material Metal case, Charging current 40000mA, Size 180x145x70mm/7.1×5.7×2.8in, Applicable voltage DC 12V/24V, Scope of application Lead-acid battery / maintenance-free battery / dry battery water battery (non-rechargeable lithium battery), Rated power 400W, Model AJ-618A.
You can create price alert here, copy coupons and view price history. What is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I don’t know if this is a good price – number of records in my database is too low!
Link: Banggood product page
1. ($41.85): Cuponation9
2. ($41.85): 9OFFSUMMER
3. ($42.31): hoNEYbGdeAlS
4. ($43.23): BG00c906
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): MVC8SPRING, 8BGwbg2204, 2203ActiesNL, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN
(probably won’t work, but you can try them out)
Price history and price alert
It’s a new item in our database, so I can’t create price history chart. We have saved this price in database: $37.99.
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).